diff toolboxes/FullBNT-1.0.7/bnt/general/shrink_obs_dims_in_table.m @ 0:e9a9cd732c1e tip

first hg version after svn

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/bnt/general/shrink_obs_dims_in_table.m	Tue Feb 10 15:05:51 2015 +0000
@@ -0,0 +1,15 @@
+function T2 = shrink_obs_dims_in_table(T1, dom, evidence)
+% SHRINK_OBS_DIMS_IN_TABLE Set observed dimensions to size 1
+% T2 = shrink_obs_dims_in_table(T1, dom, evidence)
+%
+% If 'T1' contains observed nodes, it will have 0s in the positions that are
+% inconsistent with the evidence. We now remove these 0s and set the corresponding dimensions to
+% size 1, to be consistent with the way most inference engines handle evidence, which is to
+% shrink observed nodes before doing inference.
+
+% This is used by pearl and enumerative inf. engines.
+
+odom = dom(~isemptycell(evidence(dom)));
+vals = cat(1,evidence{odom});
+ndx = mk_multi_index(length(dom), find_equiv_posns(odom, dom), vals(:));
+T2 = T1(ndx{:});